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Free Download O&O DiskStat Professional Edition 4.0.1362 (x64) Multilingual Free Download | 22.8 Mb O&O DiskStat 4: Optimize storage space and work better with Windows. There are passions for collecting that are fun. Gathering files you no longer need costs you storage space and eventually money - if you need to buy new hard drives. We have developed O&O DiskStat for you so that finding and cleaning up the space wasters does not become a time-consuming ordeal.